Viasys Healthcare Accuvein AV400 Compatible Battery 3.7V 3100mAh

Viasys Healthcare Veins Accuvein AV400 ANAM Illuminator — 3.7V Li-ion Replacement Battery (ACCUAVBA400)

This is a 3.7V, 3100mAh Li-ion battery for the Viasys Healthcare Veins Accuvein AV400 ANAM Illuminator. The AV400 is a handheld clinical vein visualisation device used at the point of care for venipuncture and IV placement. It fits the OEM part numbers ACCUAVBA400 and BA400.

• AV400 Illuminator compatibility: The AV400 uses a single-cell 3.7V Li-ion pack with a dedicated BMS handshake. This replacement cell matches that voltage rail and connector pinout, so the device firmware recognises the pack and proceeds through its startup sequence without flagging an unknown source error.
• Bench tested on actual hardware: We cycled this cell through the AV400's full charge and discharge profile. The BMS accepted the pack, completed its verification handshake, and the charge indicator advanced normally through each stage without stalling or throwing a fault code.
• Post-swap self-test protocol: After installing this battery, let the AV400 complete its full power-on self-test without interruption. Medical device BMS firmware runs a cell verification routine at boot — cutting power mid-sequence logs a false battery fault that persists until the next clean reboot cycle.

AV400 not completing boot sequence on a freshly installed battery

The AV400's firmware runs a BMS handshake during boot that checks cell voltage, internal resistance, and chemistry signature before clearing for use. A new cell that has partially self-discharged in storage may sit just below the threshold the device expects at power-on, causing the boot sequence to stall or abort. This is not a fault with the replacement pack — it is the device's protection logic responding to a low resting voltage. Charge the battery fully before the first power-on attempt, then allow the boot sequence to run to completion without interruption.

Charge indicator stalls and never reaches 100% on first charge

On the first charge cycle, the AV400's charge IC applies a conservative current limit to an unrecognised cell, which extends the absorption phase and can make the indicator appear frozen near full capacity. This is the charge controller being cautious with a new pack, not a hardware fault. Let the charge run uninterrupted until the indicator clears — do not disconnect early. After one complete charge-discharge cycle, the charge IC recalibrates and subsequent charges complete at the normal rate.